;(function(){
    $(window).on("load",function(){
        /*绑定图片懒加载 */
        screenChange($(".right-nav .unfold"));

        let rightnav=$(".right-nav").children();
        let letnav = $(".left-nav").children();
        $.each(letnav,function(index,item){
            unfold($(item), $(rightnav.get(index)));
        });
        
        
    })
})();